package com.luca.web.controller.common;

import com.google.code.kaptcha.Producer;
import com.luca.common.constant.Constants;
import com.luca.common.core.domain.JsonResult;
import com.luca.common.core.redis.RedisUtil;
import com.luca.common.utils.sign.Base64;
import com.luca.common.utils.uuid.IdUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * 验证码操作处理
 *
 * @author luca
 */
@RestController
public class CaptchaController {

    private final Producer captchaProducer;
    private final Producer captchaProducerMath;

    @Autowired
    public CaptchaController(Producer captchaProducer, Producer captchaProducerMath) {
        this.captchaProducer = captchaProducer;
        this.captchaProducerMath = captchaProducerMath;
    }

    /**
     * 验证码类型
     */
    @Value("${web.captchaType:math}")
    private String captchaType;

    /**
     * 生成验证码
     */
    @GetMapping("/captchaImage")
    public JsonResult getCode() {
        // 保存验证码信息
        String uuid = IdUtils.simpleUUID();
        String verifyKey = Constants.CAPTCHA_CODE_KEY + uuid;
        String capStr = null, code = null;
        BufferedImage image = null;
        // 生成验证码
        if (StringUtils.equals(CaptchaType.MATH.getCode(), captchaType)) {
            String capText = captchaProducerMath.createText();
            capStr = capText.substring(0, capText.lastIndexOf("@"));
            code = capText.substring(capText.lastIndexOf("@") + 1);
            image = captchaProducerMath.createImage(capStr);
        } else if (StringUtils.equals(CaptchaType.CHAR.getCode(), captchaType)) {
            capStr = code = captchaProducer.createText();
            image = captchaProducer.createImage(capStr);
        }
        RedisUtil.valueOperations.set(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try {
            ImageIO.write(image, "jpg", os);
        } catch (IOException e) {
            return JsonResult.error(e.getMessage());
        }
        return JsonResult.success(Map.of("uuid", uuid, "img", Base64.encode(os.toByteArray())));
    }
}
